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I have to admit, it was before my time that Buzzbike were using Coopers. When I was there it was mass produced Taiwanese gas pipe frames. I honestly couldn't tell you too much about them but they were seemingly decent quality with cheap but reliable components. That being said, a single crap photo and listing it as a 58 when it's clearly much smaller (it looks similar to the Buzzbikes, if not identical and those were 52s) is a bit suspicious!
I wouldn't say £140 is underpriced if it is an old Buzzbike. They're decent enough frames but pretty cheap components otherwise and it's probably had a fairly hard life.